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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd3ca7d3d02e45adb7b3ef657a401b0e3ed59287cb0f154ccc6ffae7a62951a9' 
  AND token = 'tYKaJqvVE75swdi49N/mxDxOr1TsVZCy5x+2OhtZ9dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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