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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5980be10c9aa56e121087e630782702ca7256dfa54cd67e353119e72c99ca5fe' 
  AND token = '4aPgV5uHLZXshnHhk5F7GJXUuPgul0t5HO+lptj7eNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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