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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6c534133ef90dcc7ff24d5ff9f25fcf4a651e2bdc085eb81cdfe69e7bfc5e60' 
  AND token = 'u2AOwx6aDuOQ7bck9m1gAsJRry7gXeQdJahIwHrmOQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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