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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd08e8f8611bdf8410b9bff45b66803528de0cf7ce53da328af33826aecd69b23' 
  AND token = 'FLy949sPM5HS6JE/LJ4l5UCiM9umCgsI319qeHsZ114=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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