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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbb9183cd553fbc76c8222b2d199ddf8c6d5336011114ad7accba3f4ef7ea9a0' 
  AND token = 'Grli41FvGG7thchfOYGFm6MulGX6uQo/9/uKyj5ExvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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