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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81ac1fad7334b2c66d1a0dc089d096e85d4df1c09b28a6cc3af5a3a6fe7213b2' 
  AND token = 'UAzvYRU7xesp48ag0DIksGxosnuAWt24qVMSl/fMbLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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