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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '286129bf7d81b3bc6d9b9db3dd2feab13682e5e2127267c92ebb292de7251404' 
  AND token = 'ETu9iQ3ki+YCgxEbWill2ZPu64Wd9fsVPXJU3089AAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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