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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebd92fc6521fc5335f9fbfd90d52fbbc9b5ae36a3c39c21c629e06946bcbde69' 
  AND token = 'n69pizjkbEiviztTlNT4T1OZ4Oozjcxp7o6uC5jpE3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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