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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '259431534fb329553326311a171fa6fde89c33ce0f0bf3e3e1889c21b77a69f9' 
  AND token = 'VeP2A/YA1wzFSOB/ELcWicY/AT6++lhVe5yMXw92ZkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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