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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42e3c00e459fe9757e7994674ef4401a2764dda7dd58f107e8e1a2cc97db2b5e' 
  AND token = 'MJtHJ897vzMjgo0ru886fEnD3M4MJzLVrXb8Ge1C5Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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