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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '317993bf5c17a19bc5687e98ed47c708a7a2876b9975b480593fdb656452bde8' 
  AND token = 'yAXVIHHci5uJJJdtCRI5bqGMcJVg2UbeHq0wN+cQm+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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