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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '025c94f3cf65eaac12d155ebec6d8a001d62b3a81c66f0d7a79db4fadbea92a1' 
  AND token = 'y9mUMViil8U9KGynMXOtrGWMIlyxZjnM51UQp3QnZF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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