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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb9c27bd431bea571d296133aaac2fbe6a6231d8c518fc96b6a9136ee22d9b92' 
  AND token = '31epSD5vO+sb9IeScHlQ5qQxgZlzlNlR4F2wpPEa7xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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