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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '073437f485698d86b49bbb682664d1fd8568bf43e610a55cc9720d84e436bed2' 
  AND token = '8x2yWiv6rV/1yW6irfrLpROU55gH1VeVPW4ZzDzYztU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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