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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3b26213de330e89fa0c3f7faff243ec7744e37b2de695973b4086f773e1ff52' 
  AND token = 'q48IqxH8OOKxM6xG5Nx1UdYGOE750WKSHuAuQjDInuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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