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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4758ac0c50984ad78111b1cfce1122f01908af05ac5abf13e88bb2a63b3d484' 
  AND token = '3MNthAEJKtz0IGC/u6CVtXNCJ3a50sesSa6IFpZOn+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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