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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cde130a63518f5a4670daf82b3512ed712c2a172dfe18fe1e263bc4cee52b65e' 
  AND token = '6LTys4mSVzpClF9uY5npswT3Ekg40Yzuzmp4h7WnAzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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