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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0899dce35bae3908ff654abe10745ed1a8aa2298aca79611da349ebf53156dd5' 
  AND token = 'fJt+RxI4btj5PlJhzMRL+icUFNDWCS7beGtLRJL9xYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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