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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64a06fd42232739a2bb6e0090de993f3e12c0ebf093da260d9483a77783221ee' 
  AND token = 'QtKF43/FpAmkAajpC2UdLeuoF/oKgGQTFD6LE6NpvpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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