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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d38a485b8808b36b5c79db8771f94c926fbdb35d1c8d37c12dd047fcd4130dd' 
  AND token = '/cS9BkM2oDg4ayuEk9uxPpoLQtfRpsGsxaqbvbM2vGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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