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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e720ff0a9772da227c61dcb01b87d0f2fdf6adaaff4816e245bac7cf47cc2d9' 
  AND token = 'iY6uuGmgTY68kDuxeBbFLFkCd9ufJyrpGj3Z5mjEE00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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