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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cb5ce288e87dff4d1d26bbb2b9286f321e89b6c8aa70eeb8b4f084e31d44631' 
  AND token = 'U+v92WoStoABOV+i4YHSvbrpCkMP9yQVjBEhozoWjFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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