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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06dfc345bc07bb3e31cd2ed911c86c26003900481bca1c36f2ca11a02c03adfd' 
  AND token = 'V3U1QZXO34x532fDHWmhf+s21XyFPpdEe4cQpHwjrWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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