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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fd1cd73aa29441628e79233b70ce41050834a671e1433b83ddd15ccd187d9fd' 
  AND token = 'ESW1oesZU62IOIJYoPD1sjnHi9Cqo8YlWh8MlPlEv6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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