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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '654e219c52358a9f4f760faed8d2c361e4bb1a27e69442c1b884c9ae2ed8018e' 
  AND token = 'Rd0giV47FTLKKomBK8MKClrY0sbQPUoAbCUVm73AnjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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