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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03b231c6b2e26cbe038ac7f2007707129d59e8171f883b473b85b63649c04259' 
  AND token = 'LCnmdTuLxTsiGxtu0nCt/Cihnc9NU9ktqn2eXWs2iEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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