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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc7d9c6b952e0c9bc76c9fed49beb30df7cd090d68153ff9b341e34fd110099c' 
  AND token = 'HedWK7j9WUO2Lq5OIsmD/TmR7qDSdmGEtnQjvYwzJbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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