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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfeb747eeeb21bc743504efa4ff7ce2906ff19de5b420eb8c6997b5592d9754f' 
  AND token = 'pSWac4lOm9QaRmeFccAc9HZuyBHvkY9qZfgXzsogCEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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