SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8f6980076e6c8eda89fb2f0a66b5aeca4fba8f527cea5f42f3e51a6a4d24a80' 
  AND token = 'cNPNDZ5zvXDJWVqWSu1S/iZWEjBqmHs6JpgSU1HIjrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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