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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0a9f16b92a2be85c5f7237567452be17ab9faa8b10747974bec64f85c296ec6' 
  AND token = 'Gh6fxQB+VUnk2rRulGlZmIbxnc2153PZziaNWG+9SMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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