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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd62a2d3b297f5edaa2e5e3052581e75441ed6ba2081b1af1e90eb1531f9b4d39' 
  AND token = 'cuo1ILy1GiIsoonOf2sRr0UFAorTarq466dqSAQhfjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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