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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1a9cc0719ce4aa30f0dafdfb5a90ee2d744025d0f4137f691cf33cab162ff0b' 
  AND token = 'dZTtT8FN1t/mUv4JHPJ/Y08BLUrOEJARJCwe3OcYYOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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