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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33c1d8eaa662014900c50086af561172169efec6102b230fcb14db15b879feee' 
  AND token = 'w7ayVi3VTAmWlxWr+FfneHS+p24cUBJU1kEno9acpoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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