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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c02adb658691386d1dc1187a36a96d15d5d72bec8608d7b719b0a4cc94dacb8' 
  AND token = '6LxTuUWljdiFqZWgNIvhla74xKvn3BpOuT1l+peIGXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}