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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcd03de8bb5d3a3b28e77710022bfbe2eef0fbf31e5b21591e692b388899a209' 
  AND token = 'gY0m5BUdNqTqdeaXMDWJQFt68yrtHXQ9FQfEyx02Fio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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