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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31907728bb5a09267c74a8fa0a009baf6f41135cc5459ed7757b36348cd38470' 
  AND token = '2itKhxJfX5fasD4IfIUIjs35S4QvL2PZ0IIDrQqChOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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