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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '869beaa3bff6df14ca9bb3ba8898660296673f6f5dc856be1ac33f09a0e94112' 
  AND token = 'AMxFDEzLhCKaifk/eI/JVHb6AQbX1TdleCPAf9kbgyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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