SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36fdcf85d6b479708de38dd5398a6fef66083d039c673fe03b794717d4dcc0a1' 
  AND token = 'S6z2VvmXTwyCAFDJ/jUtU5ZAID1UYXgls+pGRLM04eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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