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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49d475c02842ca7147f542c0a081b00b981b23430278472aa8101001ed17294c' 
  AND token = '0jZ/r3/xy+2RD3Zi6IACTGZfjEvdKftDt1fPfH1sZjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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