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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9140258b715a4ab2b867569ff8bb1f5e303b9eeaf749881a9a0c7b12eef38685' 
  AND token = 'VDhLaB5KjYqLYjebsiMcZR9P8l9Ke7f53Bc6b6tqpaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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