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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f178864d626d671b4df62afe7a2841a9ef6e25e993a248c564651025b5dfd9ed' 
  AND token = '2XAQvwmAa41e3r4MXU2pF1kbVY7qtJeeOzLMxA1DB14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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