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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '247f1e47bc8bcbb1ff60b736e1c87e97165e40d8ebc566f2b1bcc511b055f50d' 
  AND token = 'CkqvsIALDDU5PJcFiJ406WYxXblYXhZ2mMuWwUpzX9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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