SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0949a26520e0337275d33481d542a2cf8c4a59bdb66c05e670a3032f072eac65' 
  AND token = 'Y2J4DYEzzF5z+Vu+Fxwr9J/PSjKn1NfNJSHD7p+n9HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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