SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd9372971fdd0e4d898391235f0845b129192b4420e4f7b6fea470ffb2b86d51' 
  AND token = 'gF3c4oVzepKpTlwnHYOpGhvULVBjxKNLFg5VrLxQV0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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