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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f83027b82eba9feb9c88325c1e583dd5282a9b898c08b7042fbdc1a59279bd18' 
  AND token = 'ysuLfv39SHoXFo/iTczQFkbzzfO9xTOdr3a4HIP79kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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