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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8439cd04912d80b853ed00e2794adda1c8c16500989ecb4ee1437f557febfa0e' 
  AND token = 'wEGqaRrLMWwRNt9xfINjnQGQS6sTxQdA/RIlUYz5+dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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