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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '205ae4f19b9c9058642c820aa7e2ea73671b1cfb43f7405c5098d6bf413c793f' 
  AND token = 'tsxLnlkiiRAl53nuNA3knrSxnx/1Gg/qS6e7GBg25II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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