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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c91caedb94fa3b08fcf79a0dc4fa872057307d17664e738ba20b3d8822f2718' 
  AND token = 'y4HCaN154JoV1NKgLN0x2ZsEWql6YqpMkyarm3GE3BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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