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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ee436ffcce0a9d5c424dd1b63ac752c18342c467bba00a6456df8df9ac03d56' 
  AND token = 'wJAMKaQfpsrGvijVQO/DIJ3rcrICeOJtmSZj2M8MrXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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