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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c26593c73e8398d0acc1165e961c53ad9df70d1438f3792a6bdcb7ed75042eec' 
  AND token = '3Fjch7wStNlSMOjaDvv0QRMn5hUK9f+t8bmY2FBFRWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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