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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2489a255c3fb043d64aa2ec6368b059f6275815168168a9df43e3d8c1ea6e2db' 
  AND token = 'EwQLY8GeA872xD8zgUKOfLl9mb7uCo4j8il74nbDe44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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