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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '992ee5ea39d63f9694155b4be45a764ae33c055ce25d75dd077a1624a3a5ae8c' 
  AND token = 'Px09vlYze4SUxh1LcH2tTaybyTCJIp0zTJsJcP7NSS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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