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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9030e8c8d033f3f0616ceaf64f2540f99a081bb50f6dee0ed4be3b7837c0d3c8' 
  AND token = '9s0RmpALdj8VhA2Mtd6N4G3NE2u2FBG4zO3tS5HSqso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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