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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13da4f08fbd875caac30858062d16f05387a25f92a0c365d2ae9a8a2079b6012' 
  AND token = 'TxrnVIbSmEsmCmjW/gcQt7OmYMgmnMCUrRaSqraEB9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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