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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2738cf9a0f36e26158656766e3ab0a9cd807ac2f8327091d73a39b61307608f9' 
  AND token = 'mezn+OzIjWbskt2p+cf+FrNHHn+iEE/3ftuROU6dUnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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