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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bc948b22f9e028eede51f7c85cadf348fd55c56b48bcc49fdd98fffb6b52e1a' 
  AND token = 'AG7QHd65cEb4kagmaYBQ56lkOoFgP1443jlbVK81I8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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