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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b26564d693c296a66ab880bf4ee612d32049836b1919df3bb686e34d1c26913' 
  AND token = 'F8CE3/Pjds5/HvFAfI7h6yuq/lkDpY618sB7MYxFP14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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